carlisle



(Model.) 2 sheets-sheet; 1.

W. S. CARLISLE.

SEWING MACHINE. No 270,540 Patented Ja.n`.9,v18813.

(Model.) 2' Sheets-Sheet 2. W. S. CARLISLE.

SEWING MACHINE. No. 270,540. Patented Ja.n.9, 1883.

IINTTED STATES PATENT Ormea WILLIAM S. CARLISLE, OF WATERTO WN, NEW YORK, ASSIGNOR TO THE DAVIS SEWING MACHINE COMPANY, OF SAME PLACE.

SEWING-MACHINE.`

SPECIFICATION forming part of Letters Patent No. 270,540, dated January 9, 1883. Application tied october 5, 1882. (Model.)

To all whom it may concern Be it known that I, WILLIAM S. CARLISLE, of l/Vatertown, Jefferson county, New York, have invented anew and useful Improvement in Vertical or Top Feed Sewing-Machines, which improvement is fully set forth in the following specification.

This invention, although applicable, in part at least, to other machines, has reference more particularly to sewing-machines in which the work is fed by the conjointaction ofthe needle and needle-bar and of an auxiliary vertical feed-bar or helper-bar; and it is intended as an improvement on the well-known Davis sewing-machine. In the class of machines indicated the lateral movement for feeding is im parted to the needle after it has penetrated the work and passed through the work-plate. Obviously it is important that after each advance of the work the needle-bar should be returned to the same position, and that in its descent it should be held from side movement in order properly to penetrate the work at the right point. Heretofore it has been found necessary for this purpose to usespecial devices, which have complicated the feed mechanism, thereby enhancing the cost and rendering the apparatus less easy to run, less durable, and more liable to get out of order than would otherwise be the case. In the present invention the result is accomplished in a simple and efficient manner by utilizing the action of the revolving pin or roll upon the heart-cam commonly employed to reciprocate the needlefbar-that is to say, the pin or roll acting upon the inclined surfaces of the cam tends to move itlaterally as well as vertically, and this tendency is utilized for the purpose named. In machines having an under feed or feed working from below through the clothplate the needle slides in fixed guides in the head, and these guides resist the tendency toward side motion, and the only effect is a slight increase of friction. In the original Davis sewing-machineaspecial cam-bar, which worked in fixed guides, and on the face of which the needle-bar was pivoted, was employed. The tendency toward lateral motion being resisted by the fixed guides had no effect upon the needle-bar.

In the machine deposition.

scribed in Letters Patent No. 250,053, granted to Thomas Carey, November 29, 1881, the special cam-bar is dispensed with, and a dog with cam for acting thereon is employed to insure the positive return of the needle-bar and to hold it in its descent. The roll or pin acting upon the inclined surfaces of the cam tends to move the needle-bar in the opposite direction to the movement imparted to the feed-cam* that is to say, during the return of the needlebar and its descent it tends to advance it, and thus throw it out of true, and the dog resists the tendency and holds the needle inits proper In the present invention the cam is attached to the needle-bar, and the parts are so arranged that the roll or pin acting against the inclines tends'to return the needle-bar at the proper time and to hold it in place during its descent. To accomplish this, the shaft carrying the roll or pin is run backward or in the opposite direction to the shaft in the Carey patent. The different feeding and stitch-.forming devices are of course adapted to conform tothe new direction of rotation of the shaft which operates the needle, beingsuitably modified or changed in position, or both.

This improvement can be used in machines of otherwise ordinary or suitable construction, and in connection with any suitable feeding mechanism--as,for exam ple,in connection with feeding means such as described in the Patent No. 58,614, to Job A. Davis, October 9, 1866, or in the Carey patent referred to-the feedcams being of course modified to impart the advance movement when the needle has descended, and the return movement when it is above the Work-plate and clear ot' the work. The dog shown by Carey for insuring the positive return of the needle-bar, and the cam for operating said dog, could, when the said improvement is used, be omitted without disadvantage to the machine. The present invention, moreover, comprises special improve-- ments in the feed mechanism, as follows: Lateral movement is imparted to the vertical feeding devices by means of a lever which acts upon the said devices through the intermediary of a roller or other device having a small bearing-surface. Preferably a bell-crank lever turning on a xed center is used7 and the arm IOO 1nent,to enable the needle-slots readily to bc brought into their proper position.

The accompanying drawings, which form a part ofI this specification, represent a machine constructed in accordance with the invention.

Figure l is a sectional elevation, looking toward the standard ofthe goose-neck, the section being immediately in front of the needlehar and helper-bar, and at right angles to the length of the main shaft and goose-neck; Figs. 2 and 3, partial views in elevation, illustrating the manner of' operating the needle-bar; and Fig. 4, a plan of the work-plate.

A is the cam house or head of the machine; B, the gooscneck or stationary arm; C, the work-plate and lower part of the machineframe; C', the throat-plate; D, the needle-bar;

E, the needle-cam; F, the helper or vertical feed bar; G, the presser-bar; H, the main shaft, turning in bearings in the goose-neck; 1, the driving-pulley and fly-wheel; K, the needle-cam roll or driver for reciprocating the needle-bar; L, thefeed-cam; M, the main feedlever or bell-crank; N, the auxiliary feed-lever; l), the adjustable piece, carrying the fulcrum oflever N; P', the feed-adjusting screw; Q R, springs, and S T adjustable stops.

The helper-har F and needle-barD are placed edge to edge, the former behind the latter, as usual, and their upper ends are held in fixed guides, which allow the said bars to rise and tall, but prevent other movement, while their lower endsplay in a slot.

The needle-cam E has the ordinary irregular or heart shape groove, and is fixed toI the needle-bar. The needle-cam roll or driver K revolves with the shaft H (heilig attached to the dish ot' feed-cam L, which is keyed or shrunk on said shaft) and works in the aforesaid groovein the needle-cam. The direction of' revolution is indicated in Figs. 1, 2, and 3 by the arrow. As the roll or driver K rises and lifts the needle-bar D, it acts upon the inclined surface a, and therefore tends to move the lower part of the needle-bar and the needle fixed thereto in the opposite direction to the feed movement, and to bring the bar to a vertical position, (indicated by the broken line in Fig. 2.) During the descent ofthe needlebar the roll or driver K is acting against the inclined surface b, and therefore still tends to move the needle in thel opposite direction to the feed movement. The roll or driver acts for aportion of' the time against the surfaces c d, and tends to move the needle with the feed; but this takes place after the said needle has penetrated the fabric, and does not interfere with the working of the machine, but, so far as it has any effect, assists the feed-cani in advancing the work.

It is obvious that if' the roll or driver l be revolved, as is customary, in the direction opposite to the arrow, it would act upon the snrfaces c d while the needle is out of the work, and would tend to prevent the needle-bar from resuming its vertical position, or, if' it should become vertical, to displace it.

As -customary in the Davis machine, th helper or vertical feed bar F is held down and the presser-foot raised by a pin, e, on the needle-bar working in a cam groove or slot in the arm of a bent lever, pivoted atf to the bar F,

' and having the other connected with the presser-bar G through a pin, g, on said bar, fitting in a slot in the second arm of the. bent lever. This lever and the take-up, which is operated by a stud, h, on theneedle-bar, are not shown, because they are or may be of the ordinary well-known construction long used in theDavi-i machine. Lateral motion in the direction of the feed movement-. e., to the left, Fig. 1-is imparted to thelowerends ofthe bars D F by the bent lever or bell-crank M, which is rocked by means of the feed-cam L and intermediate connections. The lever or bell-crank M turns on a stud, i, fixed to the wall of' the head or can1-house A. lts horizontal and longer arm is provided at its end with a pin, It, carryinga roller, l, which makes Contact with the front edge of' the needle-bar. The shorter vertical arm is connected by the link m with the auxiliary lever N, the latter having its pivot or f'nlcrum atnin the adjustable piece P. The auxiliary lever is moved in the direction of the feed movement (to the left, Fig. 1) by the action of the feed-cani L, (which makes contact with the roller p about the middle of said lever N,) and conveys its motion through the lilik m to the main lever or bell-crank M, rocking it on the stud fi, and imparting to the needie-bar and vertical feed or helper bar the lateral motion required for feeding. After the bars D F have been lifted by the action ofthe cam roller or driver K on the needle-cani E, the feed-cam L leaves the rollerp, and spring Q returns the levers M N to their firstposition, and the spring t, aided by the action ot' the needle-cam roll or driver on the heart-cam, returns the needle-bar and helper-bar.

The proper position of the main feed-lever or bell-crank M when it returns is determined by the stop S, with which the horizontal arm then comes in Contact. This stop is adjustable, in order that the roller l may withoutdifculty he made to occupy the proper position to hold the needle-bar vertical in its descent. The operating-arm or arm of lever M, which acts directly upon the needle-bar, being arranged to be horizontal, or nearly so, when thrown back, the pressure of the needle-bar IOC) IIO

against the roller l is lengthwise of said arm, and is carried directly upon the iiXed stud i, whereby it is firmly resisted.

The fnlcrum-piece P is formed of a sleeve screw-threaded internally. It is carried by the screw Pf, which is supported in journalbearings and adapted to be turned by the milled head q, and the thread of said screw is engaged by thc internal thread of sleeve P. By turning lthel screw P in one direction or the other, the sleeve P and the rollerpare moved toward or away from the main shaft, so that the said rollerp will be struck by the feed-cam L sooner or later, and, thelower end ot' the auxiliary lever N being consequently moved a greater or less distance to the right, and the main lever or bell-crank M turned through a greater or less angle, the stroke of the vertical feeding devices-t0 wit, the needle and helper barsand the consequent length of stitch, will be longer or shorter. x

It is obvious that if the fulcrum-piece or sleeve P were moved a sufficient distance to the iight, the main feed-lever or bell-crank M would be held at all times clear of the stop S, and the needle-bar thus kept from becoming vertical, and that the practical operation of the machine would otherwise be disturbed. The stop T limits the movement of the said piece or sleeve in this direction and prevents the user of the machine from accidentally moving it too far.

'lhe throat-plate C', which tits in a recess in the work-plate, is made shorter than said recess, and the holes r, for the attaching-screw s, are elongated, so that a slight adjustment from side to side is allowed to the throat-plate, in order that the needle-slots t may be brought exactly to the right position, notwithstanding slight variations in the parts arising from the manufacture.

As usual in the Davis sewing-machine, there are two slots, so that when one side is worn the throat-plate may be reversed and the other slot employed.

Motion is imparted to the shuttle from the main shaft of the machine by any ordinary or suitable means, the movement being properly timed with respect to the reciprocation ofthe needle, as well understood by those skilled in the art.

Modifications may be made in the details of construction without departingfrom the spirit of the invention, and portions of the invention may be used separately. For example, the arrangement ot' levers described could be used to impart a lateral movement to a needle-bar pivoted on the face ofa cam-bar, or a bell-crank arranged with the arm which acts upon the feeding devices vertical or at an inclination between the vertical and horizontal could be used. Forms of lever other than the bellcrank could be used.

rlhe term vertical feeding devices is used in this specification to include one or more such devices. The lateral-moving needlebar is a vertical feeding device, and so also the vertical feed or helper bar. ."lhey are shown as used together; but one or the other could be used alone, and could be operated by means in whole or in part like those described.

Having now fully described my said invention and the manner of carrying the saineinto effect, what l claim is 1. The combinatioinin a vertical-feedsewingmachine, with the needle-bar movable laterally as well as vertically, ot' a feed-cam and co-operating mechanism for moving said needle-bar laterally, and separate devices, such as the needle-cam and revolvingcam roll ordriver, for reciprocating the said bar vertically, arranged and operating as explained, so that the said devices tend to move the lower end of the needle-bar while the needle is above the work in a direction opposite to the feed movement, substantially as described.

2. The combination of the backwardly-revolving shaft and cam roll or driver carried thereby with the needle -bar supported in guides and adaptedv to reciprocate vertically and to swing on a center above said shaft, and the grooved heart-cam fixed to said needle'bar, substantially as described.

3. The combination of the needle-bar, needle-cam fixed thereto, the helper or vertical feed bar, the backwardly-revolving shaft, the needle-cam rollr or driver carried thereby, the feed-cam also carried by said shaft, and mechanism operated or controlled by said feed-cam for moving said needle-bar and helper or feed bar laterally, substantially as described.

4. The combination, with vertical feeding devices, of a lever placed between said feeding devices and the inner wall of the cam house or head ot the machine, and pivoted to the said wall, a pin projecting from the face of the lever in front ot' said feeding devices, and a roller carried by said pin and bearing against the edge of said devices, substantially as described.

5. The combination, with the vertically and laterally movable needle-bar and helper-bar having their upper ends held between fixed guides, the needle-cam fixed to the said needle-bar, the shaft, and the needle-cam roll or driver carried thereby, of a feed-lever placed in the lower part of the cam house or head, and acting upon the needle-bar through a device carried by or forming part of said lever, and bearing against the needle-bar, the said device heilig a roller or its equivalent, substantially as described.

6. .The vertical feeding devices, comprising a laterally-movable needle-bar, the feed-lever turning on a fixed center for moving vsaid devices laterally, and the back contact-stop for said lever, in combination With independent means for regulatingthe stroke of the said lever, substantially as described.

7. The combination of a feed-cam, a feed-le ver, a feed-adjusting screw, and a fulcrumpiece threaded and engaging said screw, said IIO IZO

lever being pivoted to said fnlcrnm-piece, so that the adjustment thereof regulates the p0- sition of the level' with respect to the feed-cam, substantially as described.

8. The combination of the vertical feeding devices, the mechanism for reciprocating the same vertically, the main lever or bell-crank,

the auxiliary lever, the adjustable fnlcrulnpiece, the feed-cam, and the spring for returning the vertical feeding devices, substantially as described. v

9. rlhe throat'plate provided With needleslots and having elongated holes for the at taching-screws, in combination with the Workplate having a recess for said throat-plate slightly longer than the latter, so that said throat-plate is adjustable at right angles to the length of the said needle-slots, substantially as described.

'WM S. CARLISLE.

Witnesses LEVI A. J oHNsoN, J AMES C. BUR'r. 

